linux-kernel - Re: [PATCH 0/2] virtio-fs: Add 'file' mount option

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Message-ID: <151cc130-3584-4b07-96e0-765b7efa43fe@redhat.com>
Date: Thu, 11 Jul 2024 16:27:18 +0200
From: Hanna Czenczek <hreitz@...hat.com>
To: Josef Bacik <josef@...icpanda.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-doc@...r.kernel.org, virtualization@...ts.linux.dev,
 Miklos Szeredi <mszeredi@...hat.com>, German Maglione
 <gmaglione@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 Jonathan Corbet <corbet@....net>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 0/2] virtio-fs: Add 'file' mount option

On 11.07.24 10:21, Hanna Czenczek wrote:
> On 10.07.24 20:42, Josef Bacik wrote:

[...]

>> So then the question is, why does it matter what virtiofsd is 
>> exposing?  I guess
>> that's the better question.  The guest shouldn't have to care if it's a
>> directory or a file right?  The mountpoint is going to be a 
>> directory, whatever
>> is backing it shouldn't matter.  Could you describe the exact thing 
>> you're
>> trying to accomplish?  Thanks,
>
> The mount point needs to be of the same mode as the root node of the 
> mounted filesystem, or it’ll be inaccessible after mounting[1].  In 
> this case, I want to export a regular file as the root node, so the 
> root node must be a regular file, too:

Sorry, I meant “[…], so the mount point must be a regular file, too”.

Hanna